directions to churchilll
get out of marble arch, turn left, walk past "KFC" on the left hand side, after KFC, there is a street turn left there, walk up the street all the way up until you hit a dead end. There, turn RIGHT and walk about 30m. Directly on your left hand side, next to the Traffic Light, is the Hyatt Regency Churchill. You'll need to turn left at the traffic light as the entrance is on that street.
Saves you trudging through all the crowds on oxford st.